Zenamic Varistor Z21D681 was Z21L681 680V
Lead Free/Rohs Compliant
Manufactured by ATC Semitec
Sold in packs of 5
Varistor Voltage 680 V (612 min – 748 max) V1mA (v)
Maximum Allowable Voltage (Vrms) 420 AC 560 DC
Maximum Clamping Voltage 1.0 (w)
Energy (2ms) 160 J
Withstanding Surge Current 6500 A 1 time; 4000 A 2 times
Typical Capacitance (TYP) khz 460 pf
Joyin – JVR20N681K
Harris GE-MOV – V420LA40B)
Panasonic – C20DK681
Thomson – 24M00421K
Iskra – CV420K20
Siemens – 20K420
Power developments – Z380G
Samhwa – 681D-20A
Varistors have a high natural (non operating impedance) during normal standby use. A varistors impedance drops rapidly when subjected to a high voltage spike clamping the voltage to an acceptable level absorbing the unwanted energy thus protecting voltage sensitive components.
High energy absorption; excellent voltage clamping characteristics; fast response ; low idle power and high surge current capability.
Protection of all types of semi conductor; suppression of switching transients; voltage clipping and circuit damping; absorption of surge voltages associated with lightening strikes; prolongation of contact life and the protection of industrial switching circuits.